Insect repellent paper and process for making the same



- 25 making.

Patented Sept. 19, 1933 UNITED STATES INSECT BEPELLENT PAPER AND PROCESS FOR MAKING THE SALE David C. Kinnell, Montclair, N. J., assignor to D. C. Kinnell & Co., Incorporated, Montclair, N. J., a corporation of New Jersey No Drawing. Application June 25, 1931 Serial No. 546,919

9 Claims. (c1. 92-3) This invention relates to the manufacture of paper, cardboard, wall board and the like having the aromatic and insect repellent properties of wood such as cedar, camphor and other aromatic woods.

It is an object of the invention to provide a product which may be manufactured expeditiously and economically, and one which shall possess and retain for a long period of time the aromatic 10 properties of natural wood.

Other objects and advantages of the invention will appear hereinafter.

It has been found that woods which have an aromatic odor, such as cedar for example, and

which are used for insect repellent purposes, are

of such character that when ground up or otherwise prepared by ordinary methods for making paper, paper board, wall board and other similar products, do not possess sufiicient fibrousness to enable the said products to be made therefrom. Cedar, for example, when prepared by ordi nary methods reduces almost to a dust, the fibers, if any; being too short and too few, to permit the interlacing action which is necessary in paper According to the present invention,

therefore, it is proposed to provide a pulp having sufiicient fibers therein to permit paper and.

v board to be made therefrom, and to incorporate into the said pulp, or into the paper or board produced therefrom suificient aromatic materials to provide the aromatic properties of natural ar omaticwoods. Preferably the said aromatic materials are incorporatedat such stages in the manufacturing process (as hereinafter explained) to cause them to retain their aromatic properties for long periods of time.

While in the broadest aspect of the invention, I can use any fibrous pulp such as commonly used in paper making processes, adding thereto the 40 desired quantities of aromatic materials, such as aromatic oils, for example, to provide the aromatic odor, I prefer to use a pulp containing a substantial quantity of natural cedar, because of the fact that it possesses the aromatic properies of the natural wood, and these properties aid in maintaining thearomatic properties of the final product over long periods of time. I also prefer to use a pulp containing a combination of uncooked spruce pulp and cooked spruce 'pulp 5 which provide the necessary qualities of strength and binding power. One mixture of pulp which I have found to be particularly satisfactory com prises of ground cedar, 40% ground uncooked spruce and 10% cooked spruce. This pulp mixture alone, without the addition of any aromatic oils, can be made into a paper or board product, which, because of the presence of the cedar, possesses a distinct aromatic odor. It also, due to the presence of the spruce fibers, has sufficient strength for ordinary purposes.

According to my preferred process, I prepare the pulp in the usual manner and mix it with water in-a beater. Thus, if spruce and cedar are used, I grind cedar logs and uncooked spruce logs either together or'separately, and mix them in a beater with cooked spruce pulp and water in the desired proportions. Preferably, while the pulp is being mixed'in the beater, I also add a small quantity of aromatic oil, as for example, cedar oil, to the extent of about 2%, and the said oil is quickly absorbed by the pulp. Furthermore, in order to seal the aromatic oil into the pulp, I prefer to add, while the stock is still in the beater, a certain quantity of sizing materials, say 5 to 10%, such as a'mi'xture of resin and alum, the alum serving to set the resin when heat is applied in the subsequent paper making 1 a Fourdrinier or cylinder machine may be used for the paper or board making process, and the continuous sheet which emerges from the machine may be either cut into sheets and stacked, or may be rolled. v

In either case, the product which comes from the machine is then taken to a finishing or calendering machine comprising rapidly rotating pressure rollers which apply the final finish.

If desired, in order to further improve the aromatic properties of the product, additional aromatic oils, such as cedar 011, pine oil and Sassafras oil may be applied and the same is preferably applied under pressure so as to thoroughly impregnate the paper, but without leaving an oily surface. This may be accomplished conveniently by applying the oil to the rollers of the finishing machine, so that as the'paper or board goes through the machine, it is thoroughly impreg nated due to the pressure applied by the rollers.

The finished product may be used in that form for boxes, cartons, envelopes, etc. in which in-'- sect-proof qualities are desired, but the product also lends itself Well to the manufacture of wallboard by securing together several plies of medium weight board.

In the formation of such wall-board Ipreferably use an adhesive such as starch glue or be given on from the exposed face or be variously modified and embodied sin the scope of the subjoined claims.

I claim as my invention: I

1. A paper product comprising a mi fibrous material to provide strength ano. r cedar to provide an aromatic odor and having a small quantity of aromatic oil incorporated therein.

2. A paper product comprising a mixture of ground cedar, ground uncooked spruce, and cooked spruce and having a small quantity of aromatic oil incorporated therein. 3. A paper product comprising a mixture of 50% ground cedar, 40% ground uncooked spruce and 10% cooked spruce and having a small quan= tity of aromatic oil incorporated therein.

4. A paper product comprising a mixture of fibrous material to provide strength and ground cedar to provide an aromatic odor and having a small quantity of aromatic oil incorporated therein, the said. oil being sealed therein Iov sizing material.

5. A paper product comprising a mixture of ground cedar, ground uncooked spruce, and

Lemmas cooked spruce and having a small quantity of aromatic oil incorporated therein, the said all losing sealed therein by sizing material.

6. A paper product comprising a mixture of 50% ground cedar, 40% ground uncooked spruce and 10% cooked spruce and having a small quantity of aromatic oil incorporated therein, the said oil being sealed therein by sizing material.,

1. The process of making an insect repellent paper product which comprises mixing a quantity of substantially non-fibrous, but aromatic Wood pulp with a quantity of fibrous Wood pulp, adding a small proportion of aromatic oil and a small proportion of sizing material, beating the same with water, and running the same through a paper making machine.

8. The process of making an insect repellent paper product which comprises mixing a quantity,v of substantially non-fibrous, but aromatic wood pulp with a quantity of fibrous wood pulp, beating the same with Water, and running the same through a paper making machine and applying to the paper, after it is taken from the 

